Well, that's the thing. Any tech Panther brings, Terrific will be invisible to. T-Spheres>Panther's standard equip. Terrific probably has access to more higher end tech being in the DC universe.
T'Challa outpreps Stark due to his ignorance, arrogance, and knack to underestimate a guy who isn't wearing a suit of armor as standard equipment. You know, the same thing Reed does to Doom. Also, factor in this is in Panther's own book written by Hudlin. This is the same guy who writes that Panther has contingencies for Galactus. GTFOOH with that bullshit. Stark is smarter than him.